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chromium/third_party/blink/web_tests/wpt_internal/presentation/presentation-reconnect.https.html 

<!DOCTYPE html>
<html>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<button>click me</button>
<script type="module">
import {PresentationServiceMock, waitForClick} from './resources/presentation-service-mock.js';

const mock = new PresentationServiceMock();
const button = document.querySelector('button');

promise_test(async _ => {
  await waitForClick(button);

  const request = new PresentationRequest('https://example.com');
  const connection = await request.start();
  assert_not_equals(connection, null);

  const newConnection = await request.reconnect(connection.id);
  assert_equals(connection, newConnection);
}, "Test that Presentation.reconnect() resolves with existing presentation connection.");

</script>
</body>
</html>